Attorney General Jeff Sessions warned cities Monday they could lose federal money for refusing to cooperate with immigration authorities. He suggested the government would come after grant money that already has been awarded to the cities.

Warren said that’s both unconstitutional and bad for Massachusetts, which relies on international travel to boost admissions at local colleges, pour money into tourism and support the state’s “innovation economy.”

Warren, of Massachusetts, said Monday that the Supreme Court has ruled the federal government cannot use the threat of withholding assets or access to federal money in one area to coerce behavior in another area.

Massachusetts Democratic Party Chair Gus Bickford said Democrats stand with sanctuary cities, which include Cambridge, Somerville and Amherst.

Cambridge Mayor Denise Simmons called the threat of withholding funds “punitive and heartless.”

“Cambridge continues to stand proud as an inclusive, diverse and welcoming community to all whom have come here to make a better life,” Simmons said in a statement. “Today’s statement by Attorney General Sessions does not change that stance.”

AG Sessions states, "Disregard for the law must end." He's right. He should start with the President and his administration.

Somerville Mayor Joseph Curtatone tweeted: “AG Sessions states, “Disregard for the law must end.” He’s right. He should start with the President and his administration.”

Boston Mayor Marty Walsh said “the threat of cutting federal funding from cities across the country that aim to foster trusting relationships between their law enforcement and the immigrant community is irresponsible and destructive.”

Walsh has said he would shelter immigrants in City Hall if needed. Boston Commissioner William Evans has said officers won’t arrest immigrants living in the U.S. illegally unless they are accused of committing violent crimes.

There is a big difference between legal and illegal immigrants. I don’t understand why anyone would covet someone who abandoned their own country to come here and take advantage of what we built rather than do the same for their own country. Where will they be when the going gets tough here? I’m sure they won’t waste any of their blood, sweat, and tears on us.

@JoeCurtatone, #JoeCurtatone, you need to look at yourself. there is nothing wrong with what AG Sessions said. he is Standing up for the law. unlike almost every politician in Mass! Remember these idiots next year people.. Vote them all Out.. starting with Joe Curtatone, Warren. Baker , Out with the Old In with True Patriots. people that truly stand up for the law and love this country.. Obv. these elected officials only care about themselves and their own pockets!